Two-cycle internal-combustion engine.



5.0.KENYON. TWO-CYCLE INTERNAL OOMBUSTION ENGINE.

APPLICATION FILED MAR-9.19M. O

' Patented Feb. 13,1917,

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TWO-CYCLE INTERNAL COMBUSTION ENGlNE. APPupAno mEu MAR.9.'1914.

4 1,215,383. v Patented Feb.13,1917.

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' stroke of the pistons or each ,ternal-Combustion E following is aspecification.

To all whom it may can em:

Be it known that I, BERTRAM C. KENYON, a citizen ofthe United States,residing at lshawaka, in the county of St. Joseph and State of Indiana,have invented certain new and useful Improvements in Two-Cycle Inngines,of which the y Invention relates to 'improvements in two-cycle internalcombustion engines and it appertains more especially to the featurespointed out in the annexed claims.

his type of power unit is also known as a two-stroke engine because ithas a .power stroke for each two movements tons during one completerevolution of the crank shaft. The embodiment of these features inpractice'produces a much 'steadier turning movement than is possiblewith the well known Otto four cycle engine which has only one powerstroke for of four strokes of the piston complete constructlon comprisesthe use of two opbecomes available for each one-half revolu tion of theshaft thus increasing the steadi-' ness of action very materially over asingle cylinder of the same type. I

- In addition engines of this type entirely these ports are formed inthe cylinadmit the power charges and also permit the exhaust gases toleave the cjlinconstruction and the minimum number of actuating partsenables one to build this form 0 engine, more economically andwith'greater rapidity than similar engines have been made heretofore.With these and correlated endsin view I in t . The cost of my-inventionwithout specific details shown.

Figure 1. shows a side elevation in sec tion.

.Fig. Fig. 1.

Fig. 3. is an end view broken away.

2. is a cross section on line 3 y of showing parts of Fig.3. v

Fig. 5. is an elevation in section showing the crank disk recess. I v

Specification of Letters Patent. Application filed mm]. 9,

pistons and cross head slide.

with timing gears and valves. J11

g recesses 10 and 10 -1I1g S. I valve 14- and pipe 15. T Fig. 4. is alengthwise section online w w I 1914.. Serial no. szaeaa.

Fig. is an elevationof a crank disk and crank pin fastening. -F1g.' is aperspective e drawings the locationuof the carsecure the shortest andleast pas- Ifatented'Febl 13,1917.

of the one-part: k

showing sageways between the compression chamber and the workingcylinders.

Two cylinders, 1 and 2 are-cast with the usual waterjacketing, anenlarged rectangular opening' leading into the cylinder proper, inletand outlet ports .and the required by-. passes. 7 When these castingsare joined so that the flanges 3 register with each other and suitablebolts 4 hold them together a large rectangular chamber is formed,onehalf D portion in casting 2 and the other half or E portion incylinder 1. Inlet chambers A and A and,exhaust openings B and Bf areforme uncovered by the pistons in their to and fro movement.

The cylinders have lugs 5 cast thereon by I which they-are secured tothe chassis of an their outer ends and central of the cast-in,

"heads. Inlet ports 7, arranged in pairs, lead into cylinders 1 and '2from the chambers A and A and exhaust ports 8, similarly arranged lfadout of the cylinders into exhaust areas B a d B. These may be led intowhatever arrangement of pipes, etc.,. desired. Cooling chambers 9 arecast around the working ends of the cylinders and annular are cast intothe inner end of the cylinders so as to open into the compression spacesE and From recess 0' a by-pass 11 leads to inlet chamber A servingcylinder 1 and from recess 10 bypass 12 leads to inlet chamber A servingcylinder 2. The fuel intake is placed on the joining line between thetwocylindefcast It comprises thecarbureter 13, check he piston castingcombines, pistons 16 and a rectangular cross head frame 17. The pistonsare hollow, having deflecting projections 18'cast on their working endsso so as to be alternately r and the usual paekinga-ings 19 encirclethem. The rectangular. frame 17 stroke emanating from cylinder 1, thusbescrves as a compression piston, while sliding ing gotten ready for itsignition as" the to and fro in chambers E and D, alternately strokeends, again pushing the pistons tosucking in fuel charges andcompressing ward cylinder land repeating the operation. 5 them ready fordelivery to the working The exhaust Occurs as the pistons reach thecylinders. The deflectors 18 may be cast as end of the power stroke byreason of ports shown in Fig. 7 on an arc of a circle concen- 8 beinguncovered by the pistons in alter-- trio with the piston, presenting aconvex wall nate order. The inrushing charges are detoward the inletport, or in any other form flected by projections 18 toward the ends ofdesired. the cylinders from which they recurve andgygg, Within therectangular frame a cross'head drive out the products of combustion ofthe 20 slides transversely to the movement ofpreviousexplosionbuttheirprogress-through the pistons. This may have anyanti-fricthe exhaust ports 8 is arrested on the first tion. lining andoiling arrangement desired. portion of the out stroke of the pistons.

A crank pin 21 rotates within it. This pin When engines of this type areused or as may be forged solid with crank disk 22 and automobileservice'they may be placed transshaft 23, while disk 24 may be forgedsolid versely of the chassis to advantage, as then with shaft 25. Thecrank pin 21 is tapered it is a simple matter to connect the driving at26 where it enters a corresponding hole shaft to the crank shaft by asuitablc clutch, I of the disk 24 and to which it is secured by one partof which may be formed in the fly a pin 27. To assist in keeping thedisks cenwheel. From the foregoing escription it tral concentric bosses28 are formed. These, will be seen that enginesbuilt to my novel rotatein corresponding recesses formed in type are as simple as possible tomake and the engine castings. Shafts 23 and have likewise free fromomplexity of operation.

, 25 hearing in projections 29 cast half and half Engines of the twostroke type'have'hereto- 9a in the main castings. In addition the disksfore been made with separate pistons, tie

22 and 24 fit into annular recesses so as torods, connecting rods, barcranks, 'stufling seal in the movement of the compressing boxes, rollercranks, splines, gudgeon pins,

. frame 17 and prevent the compression eakperforate pistons, etc., allof which parts are 30 ing from the recesses. 10 and .10 onto the omittedin my engine hence its simplicity n5 opposite side of 17 through thespace occu-- is quite obvious. v

pied by the disks 22 and 24:. This is accom- What I claim is, plishedby'castin'g a wall 30 at four points 1. In internal combustion engines,a pair 7 opposite the vertical diameters of disks 22 of pistonsintegrally formed with each other a and 2 1 thus sealing off chambers 10and 10' having an enlarged transverse rectangular and as shownin Fig. 4.frame serving as a compressor therebetween The rectangular compressionchamber whose walls in one plane are approximately E-D in which thesupplemental piston the same as the piston diameter and in a 17 slidesserves a double purpose, by formplane perpendicular thereto projectradially 40 ing a means for compressing the working from the pistonsforming a rectangular 105 charges and at the same time preventing thespace within the walls with open sides therepistons turning on theiraxes, thus avoiding to, a suitable casing for the pistons having the useof inefficient splines or other makewalls which inclose separatecylinders and shifts to prevent twisting strains and fricpreliminarycompression chambers the latter tion between the crank pin and drivingatbeing rectangular to conform to the shape me tachment to the pistons.of the compressor frame forming a guide The procession of operation maybe defor such frame and at the same time closing scribed as follows. Airand fuel are sucked the open sides of the frame, inlet and outlet pastthe checkvalve into chambers E and ports to the cylinders, separatepassage-ways D on the out stroke of pistons into cylinder connectingfrom the compressing chambers 115 1 which on their return stroke towardto the inlet ports of opposite cylinders, cylinder 2 is compressed in"space D and whereby as the pistons move to and fro flow recess 10'. Justas soon as this stroke has is established in the passage ways inalterabout ended the compressed charge will rush nate sequence.

through by-pass 11, chamber A and ports 7 2. In internal combustionengines, a pair 126 into cylinder 1 where it is further comof oppositelyplaced-interconnected cylinpressed as the piston again moves into thisders, an enlarged rectangular chamber becylinder When at the endof thisstroke the tween them inclosed by their connecting charge is ignited andthe pistons are sent walls, an integrally formed power unitcomtoward'cylinder 2, repeating the operation. prising an open sidedrectangular frame be- 12 As the piston moved into cylinder 1 the tweenthe two pistons the pistons and frame charge contained in chamber E wascombeing simultaneously movable respectively ressed and forced intorecess 10 from which in the cylinders and said chamber, a crank y itrushed through by-pass 12 into cylinder shaft, crank disks thereon,recesses in the 2, to be further compressed on the power walls of theenlarged chamber for said disks, 1:

25 mg closed by the crank disks and the side ELMER G. RICHARDS.

a crank pin connecting the disks, a movable Walls of the chamber, across head on the ,member on said p1n,'means for operativel} crank pinand slidable within the rectanguconnecting the member and the frame oflarframe, and suitable passage-Ways from the power unit, 'andmeansembodying the the supplementary annular chambers to the walls of theenlarged chamber and the disks opposite cylinders. 30 for closing theopen sides of the frame. 4. A double ended piston, a rectangular 3. Ininternal combustion engines, a twoframe castintegrally with said pistonthe part casting comprising a rectangular porwalls of which'are adaptedto serve as sup tion forming a compression chamber oneplemental pistons,a rectangular two-part half in each'part, a cylinder in each partchamber inclosing said walls, separate ,cyl- 35 connecting with thechamber, a supplemeninders cast integrally with the chamber tal enlargedannular chamber between each walls, a sliding block within the rectangucylinder and the compression chamber, suit: lar frame, circular recesseswithin the cham a' le bearings transverse of such chamber, ber walls,crank disks rotatable in said recircular recesses formed on the innerwalls cesses, a crank pin passing through the slid- 4 of the chamberconcentric with the hear ing block and connected to each crank disk,ings, crank disks in such recesses, a crank shaft extensions to thedisks, and suitable pin joining the disks, suitable shafts exducts orpassage ways leading between the tending into the beam gs from thedisks, cylinders and the rectangular chambers.

a one-plece reciprocating member comprisn testimony, whereof I affix mysigna- 5 ing two power pistons slidable in the cylinture in presence oftwo witnesses. ders aforesaid and an open sided rectangu- BERTRAM O. KENYON lar frame movable in the compression 'cham- Witnesses:

ber between the cylinders its open sides be- EDWIN F. MOORE,

